Photographic roll-film.



no MODEL.

. PATENTE-D mm 21 1904., F. SGHMID.

PHOTOGRAPHIG ROLL FILM. APPLICATION mm m. 21. 19 1.

Fig.2 9.

UNITED ST T S FREDERICK SCHMID,

OF NEW YORK, N. Y.

PHOTOGRAPHIC ROLL-FILM.

SPECIFICATION forming part of Letters Patent No. 763,024, dated June 21,1904.

' Application filed March 21, 1901. Serial No. 52,135. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK SCHMID, a

subject of the Emperor of Germany, and a resi-.

dent of thecity of Greater New York, in, the borough of Manhattan, inthe county and State .of New York, have invented certain new and usefulImprovements in Photographic Roll- Films, of which the following is aspecification.

In all of the so-called roll-holding photographic cameras in vogue atthe present time in which the spool of film is containedin a receptacleon either side of the focal plane and in which continuous film isemployed the image can not be focused on a focusing-screen withouthaving to either roll the film up or remove it from the camera. By myinvention I am enabled to focus each of the images prior to the exposurefor the sensitive photographic surface, respectively, without having toremove the film from the camera or disturb its connection with the reelwhich reels it off from the supply-spool.

The different features of my invention illustrated in the drawingshereto attached are clearly described in the specification and finallypointed out in the claims.

Figure 1 is adetail plan view of a strip of photographic materialembodying my invention. Fig. 2 is a similar view illustrating alighttight wrapping for the same.

The strip of photographic material, Fig. 1, is composed of sensitivematerial and focusing-screens of suflicient length to cover the focusingscreen aperture of a camera. I

prefer to form the strip, Fig. 1, with the al- I ternate sections S andF of sufficient lengths as will admit of variations in the thickness ofthe reels of a roll-film camera as the material is wound-from one of thereels to the My invention relates to films for that class other and atthe same time leave a sufficient length between upon which to take thedesired picture, and in this connection I prefer to sensitize only thatportion S of the strip which will be necessary for the exposure andemploy as a base upon which the sensitized material is spread aroughened or sandblasted strip of translucent material, such ascelluloid, whereby the intervening space F, having a sufficient degreeof granular effect, is adapted as a focusing-screen on which to focusthe alternate exposures to be made upon the sensitive portions S. r

The opaque back, Fig. 2, consists of the usual black paper wrappingcommon to filmcartridges, with the exception that windows or openings Ware cut out along its length at intervals corresponding with thesections of the focusing-screen F of- Fig. 1. The indizations (1, &c.,denoting the number of exposures) on the back or wrapper, Fig. 2, forthe .successive exposures are situated at points which embrace both thelength of the sensitized portions of the strip, Fig. 1, andtheunsensitized or focusing-screen lengths F.

The strip, Fig. 1, is secured to the paper back or wrapper, Fig. 2, inthe usual manner, and the two together are wound upon the camera-reel,as in practice in the manufacture of light-proof film-cartridges invogue at the present time.

In adopting translucent celluloid as a support for the photographicemulsion when the granular effect of the strip of support is not desiredI prefer to sensitize the sections S, as already stated, and, in lieu ofthe focusingscreens F, I can secure the usual focusingscreen in thecamera-back in close proximity to the focal plane, so that the roughenedsurface of the focusing-screen of the camera will lie as close to thefilm as possible, in which case the spaces F are employed merely aswindows through which the image is projected from the optical system ofthe camera upon the focusing-screen a, and in this case the sections Fform merely a connection between the successive sensitive sections S ofthe strip, Fig. 1.

I am aware that prior to my invention it has been customary whenemploying roll-film in photographic cameras to focus the image on afocusing-screen for each of the successive exposures alternately, andIdonot, therefore, desire to claim this feature broadly, as it has been tosome considerable extent in vogue in connection with roll-holders whenapplied to the camera-back in lieu of plate-holders, and I am also awarethat it has been applied to cameras having a receptacle for a film spooland reel; but in this latter case the film was either wound up so as tobe clear of the focal plane when the focusing-screen was exposed to thelight or the spool containing the sensitive film taken out; but

What I do claim as being new, and desire to secure by Letters Patent, is

1. A continuous photographic film, having a sensitized part and alsohaving a non-sensitized translucent part, upon which latter part theobject may be projected, for the purpose specified, before exposing thesensitized part.

2. A photographic film having a plurality of non-sensitized translucentparts, said film also having sensitized portions alternating between thenon-sensitized parts, the non-sensitized parts of the film being adaptedto have the objects projected upon them, for the purposespecified,before the exposure of the sensitized portions of the film.

3. A photographic film, consisting of a rollable, translucent strip withalternating sensitized and unsensitized sections; substantially asdescribed.

4:. A photographic film, consisting of a rollable, translucent stripwith alternating sensitized and unsensitized sections, of equal lengths;substantially as described.

5. A photographic film, consisting of a rollable strip of roughenedtranslucent material having sensitized and unsensitized sections;substantially as described.

6. A photographic film consisting of a rollable strip with alternatingsensitized and unsensitized sections, and an opaque back upon saidstrip, with openings adapted to register with its said unsensitizedsections; substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERICK SOHMID.

Witnesses:

OTTO GoERz, HENRY I R. GEISLER.

